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- W2090320977 abstract "Fingerprinting is a widely-used technique for efficiently verifying that two files are identical. More generally, linear sketching is a form of lossy compression (based on random projections) that also enables the dissimilarity of non-identical files to be estimated. Many sketches have been proposed for dissimilarity measures that decompose coordinate-wise such as the Hamming distance between alphanumeric strings, or the Euclidean distance between vectors. However, virtually nothing is known on sketches that would accommodate alignment errors. With such errors, Hamming or Euclidean distances are rendered useless: a small misalignment may result in a file that looks very dissimilar to the original file according such measures. In this paper, we present the first linear sketch that is robust to a small number of alignment errors. Specifically, the sketch can be used to determine whether two files are within a small Hamming distance of being a cyclic shift of each other. Furthermore, the sketch is homomorphic with respect to rotations: it is possible to construct the sketch of a cyclic shift of a file given only the sketch of the original file. The relevant dissimilarity measure, known as the shift distance, arises in the context of embedding edit distance and our result addressed an open problem [Question 13 in Indyk-McGregor-Newman-Onak'11] with a rather surprising outcome. Our sketch projects a length $n$ file into D(n) ⋅ polylog n dimensions where D(n)l n is the number of divisors of n. The striking fact is that this is near-optimal, i.e., the D(n) dependence is inherent to a problem that is ostensibly about lossy compression." @default.
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- W2090320977 date "2013-06-01" @default.
- W2090320977 modified "2023-10-15" @default.
- W2090320977 title "Homomorphic fingerprints under misalignments" @default.
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- W2090320977 doi "https://doi.org/10.1145/2488608.2488726" @default.
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